This paper presents HFC32 boiling heat transfer coefficients measured inside a small Brazed Plate Heat Exchanger (BPHE): the effects of heat flux, saturation temperature (pressure), and outlet conditions are investigated. The experimental tests were carried out at three different saturation temperatures (10, 15, and 20°C) and four different evaporator outlet conditions (vapour quality around 0.80 and 1.00, vapour superheating around 5 and 10°C). The heat transfer coefficients show great sensitivity to heat flux and outlet conditions and weak sensitivity to saturation temperature (pressure). The saturated boiling heat transfer coefficients were compared with a new model for refrigerant vaporisation inside BPHE: the mean absolute percentage deviation between calculated and experimental data is 4.7%. HFC32 exhibits heat transfer coefficients 20-30% lower than those of HFC410A under the same operating conditions.

HFC32 Vaporisation Inside A Brazed Plate Heat Exchanger

LONGO, GIOVANNI ANTONIO;MANCIN, SIMONE;RIGHETTI, GIULIA;ZILIO, CLAUDIO
2015

Abstract

This paper presents HFC32 boiling heat transfer coefficients measured inside a small Brazed Plate Heat Exchanger (BPHE): the effects of heat flux, saturation temperature (pressure), and outlet conditions are investigated. The experimental tests were carried out at three different saturation temperatures (10, 15, and 20°C) and four different evaporator outlet conditions (vapour quality around 0.80 and 1.00, vapour superheating around 5 and 10°C). The heat transfer coefficients show great sensitivity to heat flux and outlet conditions and weak sensitivity to saturation temperature (pressure). The saturated boiling heat transfer coefficients were compared with a new model for refrigerant vaporisation inside BPHE: the mean absolute percentage deviation between calculated and experimental data is 4.7%. HFC32 exhibits heat transfer coefficients 20-30% lower than those of HFC410A under the same operating conditions.
2015
Proc. of the 24th IIR International Congress Of Refrigeration, ICR 2015
9781510812062
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3188461
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